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Finding the Fourth Proportional to 82.15, 113.31 and 58.79

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Solution

The fourth proportional to 82.15, 113.31 and 58.79 is: 81.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.15 : 113.31 = 58.79 : x
  2. Step 2: Convert to fraction form
    82.15/113.31 = 58.79/x
  3. Step 3: Cross multiply
    82.15x = 113.31 × 58.79
  4. Step 4: Simplify right side
    82.15x = 6,661.20
  5. Step 5: Solve for x
    x = 6,661.20/82.15
  6. Step 6: Final answer
    x = 81.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.